可以对每一个端口单独进行操作，不影响其他端口，此库调用系统库里关于IO的API函数编写，所以调用此库前，必须保证系统IO端口API函数已加载 -Each port can operate alone, does not affect other ports, this library system, library calls the API function on the IO to prepare, so call the library before the system must e